The shape-from-shading problem has received much attention in the Computer Vision literature in recent years. The basic problem is to recover the shape z(x; y) of a surface from a given map of its shading, i.e. its variation of brightness over a given domain. Mathematically, one has to solve approximately the image irradiance equation R(p; q)(x; y) = E(x; y) relating a given image irradiance E(...

Both Rho-kinase and the Ca(2+)/calmodulin-dependent myosin light chain (MLC) kinase increase the phosphorylation of MLC. We show that upon thrombin receptor stimulation by low-dose thrombin or the peptide ligand YFLLRNP, or upon thromboxane receptor activation by U46619, shape change and MLC phosphorylation in human platelets proceed through a pathway that does not involve an increase in cytoso...

W e present a method f o r determining the skeletal shape description f o r letters in texts faded due t o ageing and/or poor ink quality. The proposed algorithm is interesting in that it neither involves assumptions about demarcation of object regions f r o m the background, nor does it require pixel connectivity in the text regions. Consequently, it m a y be applied f o r obtaining the shape ...

In this paper, a new method for recovering gas absorbance shape using wavelength modulation spectroscopy is proposed. We have mathematically proven that the gas absorbance shape can be directly recovered using the data of X and Y components of odd harmonics, regardless of the value of the modulation depth. The transitions of NH(3) near 1531 nm are selected to recover the absorbance shape using ...

in this work, we report synthesis of silver nanoplates by a simple reduction process of silver nitrate in the presence of polyvinyl alcohol (pva) and n,n'-dimethyl formamide (dmf). the characterization of the samples were carried out using x-ray diffraction (xrd), transmission-electron microscopy (tem) and uv-vis spectroscopy. absorption spectra of the nanoplates in comparison with that of...

and saw that their graphs were parabolas. Since this shape was so different from a circle, with what did not appear to me to be an enormous difference in mathematical form, I wondered what other curves of the form x + y = 1 would look like. Fortunately, I have an Atari 800 computer at home which allows me the opportunity to make such an investigation relatively simple. Eventually, I became bore...

This paper presents new methods to automatically build Point Distribution Models for faces represented in images. These models consider significant points of faces from several images and study them in order to obtain the mean shape of the object and the main modes of variation. Active Shape Models and Active Appearance Models use the Point Distribution Model to segment the modelled object in n...

If the vibration problem My+ By+Ky = 0,y(t0 ) = y0 ,y(t0 ) = y0 , is cast into state-space form x = Ax,x(t0 ) = x0 , so far only two-sided bounds on x(t) could be derived, but not on the quantities y(t) and y(t) . By means of new methods, this gap is now filled by deriving two-sided bounds on y(t) and y(t) ; they have the same shape as those for x(t) . The best constants in the upper bounds are...

BaF, scintillator detectors are now in common use for the measurement of y-rays over a wide energy range because of the relatively high detection efficiency and the fast response which allows subnanosecond timing [1,2]. The BaF, scintillation light consists primarily of two components with decay times of or = 600 ps and TV = 620 ns [2], and the ratio of the intensities associated with each of t...

Abstract: We consider a set of parameterized planar arcs (x(t), y(t)) (0≤ t≤1), satisfying certain smoothness, regularity and monotonicity conditions (in particuler x(t) is monotone increasing, and y(t) positive and unimodal), and a functional J (y) involving an adjustable weighting function ω(t) and a positive constant α > 1. We first prove the strict convexity of the functional for α ≥ 2. Und...